论文和技术资料

The Tesla valve is a passive fluidic diode that achieves directional flow resistance solely through geometric asymmetry. While its underlying principle has been extensively investigated in fluid dynamics, translating this concept into solid-state thermal devices remains largely unexplored. In this work, we establish a computational framework that bridges fluid transport and phonon heat transport using COMSOL Multiphysics. We first employed the Laminar Flow Module to investigate fluid transport in Tesla valve geometries with different numbers of stages. Numerical simulations reveal that increasing the number of Tesla stages significantly enhances flow rectification by amplifying asymmetric pressure loss and vortex formation, providing clear design guidelines for directional transport. Inspired by these fluidic simulations, we designed graphite-based solid-state Tesla valves to manipulate phonon transport. Heat conduction was modeled using the Heat Transfer Module, where experimentally measured thermal conductivities were incorporated to reproduce realistic thermal transport. By combining the asymmetric Tesla geometry with the phonon hydrodynamic transport regime, the simulations guided the fabrication of solid-state phonon Tesla valves that exhibit directional heat conduction. Experimental measurements demonstrated the first realization of thermal rectification based on phonon hydrodynamics in a solid-state Tesla valve, achieving a rectification ratio of 1.15 in a single-stage device. Guided by further COMSOL optimization, a two-stage Tesla valve was subsequently designed, fabricated, and experimentally shown to enhance the rectification ratio to 1.22. The numerical results consistently capture the asymmetric heat flux distribution and directional thermal resistance responsible for the observed diode effect. This work demonstrates how COMSOL-based multiphysics simulations can bridge classical fluid dynamics and solid-state phonon transport, providing a versatile methodology for translating fluidic transport concepts into high-performance thermal management devices based on phonon hydrodynamics.